Revert "invenory problem"

This reverts commit 805c5ae.

src/pocketmine/inventory/SimpleTransactionGroup.php

@@ -148,69 +148,7 @@ protected function matchItems(array &$needItems, array &$haveItems) {
 		return true;
 	}
 
-	public function squashDuplicateSlotChanges() {
-		$slotChanges = [];		
-		$inventories = [];
-
-		$slots = [];
-
-		foreach($this->transactions as $key => $tr) {
-			if (empty($this->getSource()->getCurrentWindow())) {
-				continue;
-			}
-			$slotChanges[$h = (spl_object_hash($tr->getInventory()) . "@" . $tr->getSlot())][] = $tr;
-			$inventories[$h] = $tr->getInventory();
-			$slots[$h] = $tr->getSlot();			
-		}
-
-		foreach($slotChanges as $hash => $list) {
-			if(count($list) === 1) { 
-				continue;
-			}
-			$inventory = $inventories[$hash];
-			$slot = $slots[$hash];
-
-			$sourceItem = $inventory->getItem($slot);
-
-			$targetItem = $this->findResultItem($sourceItem, $list);
-			if($targetItem === null){
-				return false;
-			}
-
-			foreach($list as $transaction){
-				unset($this->transactions[spl_object_hash($transaction)]);
-			}
-
-			if(!$targetItem->equalsExact($sourceItem)){
-				$this->addTransaction(new BaseTransaction($inventory, $slot, $sourceItem, $targetItem));
-			}
-		}
-		return true;
-	}
-
-	protected function findResultItem($needOrigin, array $possibleActions) : ?Item{
-		foreach($possibleActions as $i => $action){
-			if($action->getSourceItem()->equalsExact($needOrigin)){
-				$newList = $possibleActions;
-				unset($newList[$i]);
-				if(count($newList) === 0){
-					return $action->getTargetItem();
-				}
-				$result = $this->findResultItem($action->getTargetItem(), $newList);
-				if($result !== null){
-					return $result;
-				}
-			}
-		}
-
-		return null;
-	}
-
 	public function canExecute() {
-		// if (!$this->squashDuplicateSlotChanges()) {
-		// 	return false;
-		// }
-
 		$haveItems = [];
 		$needItems = [];